Skip to content

Coverage for coding agents working overnight

Measure code coverage with npx supercov and write tests til 100%.

Any coding agent

Use Supercov to improve coverage. Only write tests. Keep going while useful gaps remain.

Codex

Claude Code

Cursor

Gemini CLI

GitHub Copilot

Improve test coverage•••

Working

4m 45s

Supercov gives the agent the next test to write.

Each run returns the uncovered paths. The agent adds focused tests, reruns the suite, and continues while useful gaps remain.

Use leftover tokens on coverage.

Before a reset—or overnight—turn idle agent time into coverage that stays with the repository.

Any test suite.

Works with the test suites you already use.

Any language.

JavaScript, TypeScript, and Rust—with more to come.

For software factories.

Every pass returns fresh, executable evidence, so agents can keep iterating around the clock while regressions are caught before they ship.

Coverage agents can act on.

From lines and branches to MC/DC, every gap becomes the next test to write.

Low overhead.

Fast instrumentation keeps the test loop moving.

3.4kGitHub stars↗

npm downloads

200k+weekly downloads

Supported by Supercorp.

Backed by Supercorp’s open-source track record.

Any agent.

Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot—and more.

Free and open source.

MIT licensed. Inspect, extend, and run it anywhere.